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VSN support functions  Additional functions are required to handle splitting and merging phenomenons 9WMSN 2008 FunctionUsage Form_Discover_VSN(msg) Nodes that detect a relevant event for the first time Unsubscribe_VSN(msg) Unsubscribe if no longer need to be in a VSN Unicast_VSN(destination, type, data) Muticast_VSN(type, data) Broadcast_VSN(data) VSN communication